Perhaps you should try some spelling variations:
lam thuoc » nam thuoc, am thuc, cay thuoc
hieu van » hieu va, thien van, lieu va
thanh vi » hanh vi, thanh va, thanh ve
dang xay » dang van, van xay
lam tuc » lam truoc, luat tuc, nam thuc
cua tre » cua te, cuu tre, cua triet
lang xa » lang ha, lang van
san ky » sang ky, van ky, dan ky
vi cua » vai cua, di cua
tu san » thu san, tu ban, tu can

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu san ky ((lang xa) or (dang xay)) hoi. hieu van ((lam tuc) OR (lam thuoc)) gia thanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu san ky ((lang xa) OR (dang xay)) hoi. hieu van ((lam tuc) OR (lam thuoc)) gia thanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu san ky ((lang xa) or (dang xay)) hoi. hieu van ((lam tuc) OR (lam thuoc)) gia thanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: tu san ky ((lang xa) or (dang xay)) hoi. hieu van ((lam tuc) OR (lam thuoc)) gia thanh vi cua tre*.